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| author | Hal Finkel <hfinkel@anl.gov> | 2013-12-12 20:45:24 +0000 |
|---|---|---|
| committer | Hal Finkel <hfinkel@anl.gov> | 2013-12-12 20:45:24 +0000 |
| commit | 1e3d96622a823d86dbfcbcd6736a57a0052da0d1 (patch) | |
| tree | 7db4e397e07a9c2b534134bfb34446e767aadba5 /test | |
| parent | 8cd46c06f2e040738abe909bd9e90d87dc19a593 (diff) | |
| download | llvm-1e3d96622a823d86dbfcbcd6736a57a0052da0d1.tar.gz llvm-1e3d96622a823d86dbfcbcd6736a57a0052da0d1.tar.bz2 llvm-1e3d96622a823d86dbfcbcd6736a57a0052da0d1.tar.xz | |
Fix a use-after-free error in GlobalOpt CleanupConstantGlobalUsers
GlobalOpt's CleanupConstantGlobalUsers function uses a worklist array to manage
constant users to be visited. The pointers in this array need to be weak
handles because when we delete a constant array, we may also be holding a
pointer to one of its elements (or an element of one of its elements if we're
dealing with an array of arrays) in the worklist.
Fixes PR17347.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197178 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test')
| -rw-r--r-- | test/Transforms/GlobalOpt/array-elem-refs.ll | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/test/Transforms/GlobalOpt/array-elem-refs.ll b/test/Transforms/GlobalOpt/array-elem-refs.ll new file mode 100644 index 0000000000..ec472b0e99 --- /dev/null +++ b/test/Transforms/GlobalOpt/array-elem-refs.ll @@ -0,0 +1,32 @@ +; RUN: opt < %s -S -globalopt | FileCheck %s +target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128" +target triple = "x86_64-unknown-linux-gnu" + +%struct.S = type { i8, i8 } + +@c = internal global i8** bitcast (i8* getelementptr (i8* bitcast ([8 x i8*]* @b to i8*), i64 48) to i8**), align 8 +@b = internal global [8 x i8*] [i8* null, i8* null, i8* null, i8* null, i8* null, i8* null, i8* getelementptr inbounds (%struct.S* @a, i32 0, i32 0), i8* getelementptr (i8* getelementptr inbounds (%struct.S* @a, i32 0, i32 0), i64 1)], align 16 +@a = internal global %struct.S zeroinitializer, align 1 + +; Function Attrs: nounwind uwtable +define signext i8 @foo() #0 { +entry: + %0 = load i8*** @c, align 8 + %1 = load i8** %0, align 8 + %2 = load i8* %1, align 1 + ret i8 %2 + +; CHECK-LABEL: @foo +; CHECK: ret i8 0 +} + +; Function Attrs: nounwind uwtable +define i32 @main() #0 { +entry: + %retval = alloca i32, align 4 + store i32 0, i32* %retval + ret i32 0 +} + +attributes #0 = { nounwind uwtable } + |